{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,11,20]],"date-time":"2024-11-20T05:30:11Z","timestamp":1732080611808,"version":"3.28.0"},"reference-count":45,"publisher":"Geological Society of London","issue":"1","license":[{"start":{"date-parts":[[1989,1,1]],"date-time":"1989-01-01T00:00:00Z","timestamp":599616000000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"content-domain":{"domain":["www.lyellcollection.org"],"crossmark-restriction":true},"short-container-title":["JGS"],"published-print":{"date-parts":[[1989,1]]},"abstract":"<jats:p>\n Sedimentary rhythmites of siltstone and fine sandstone from late Precambrian (c. 650\u2013800 Ma) glaciogenic formations in South Australia are interpreted as distal ebb-tidal deposits that record variability in the velocity and range of palaeo-ebb tides. Variations in lamina thickness encode a full spectrum of palaeotidal cycles, including semidiurnal, diurnal, fortnightly and monthly tidal cycles as well as the lunar apsides (perigee) and nodal cycles. A half-yearly oscillation is attributable largely to a beat between the fortnightly tidal cycles of luni-solar conjunction and lunar declination; the lunar nodal cycle is discernible as an amplitude modulation of this beat oscillation. The data allow determination of the Earth's palaeorotation and the past dynamics of the Earth-Moon system with an accuracy previously unattainable for the Precambrian. The late Precambrian (c. 650 Ma) year contained 13.1 (\u00b10.5) lunar months and\n <jats:italic>c.<\/jats:italic>\n 400 (\u00b120) days, and the late Precambrian lunar month c. 30.5 (\u00b11.5) days. These values suggest an average equivalent phase lag near 3\n <jats:sup>\u00b0<\/jats:sup>\n since late Precambrian time rather than the present value of 6\n <jats:sup>\u00b0<\/jats:sup>\n . The period of 19.5 (\u00b10.5) years determined for the lunar nodal cycle\n <jats:italic>c<\/jats:italic>\n . 650 Ma ago indicates a lunar distance 96.9 (\u00b11.7)% of the present distance. The low rate of lunar recession since late Precambrian time revealed by the rhythmite data militates against a close approach of the Moon during the Proterozoic. Precambrian sedimentary rhythmites may hold a key to the early history of the Earth's rotation.\n <\/jats:p>","DOI":"10.1144\/gsjgs.146.1.0097","type":"journal-article","created":{"date-parts":[[2007,12,20]],"date-time":"2007-12-20T22:39:02Z","timestamp":1198190342000},"page":"97-111","update-policy":"http:\/\/dx.doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":124,"title":["Late Precambrian tidal rhythmites in South Australia and the history of the Earth's rotation"],"prefix":"10.1144","volume":"146","author":[{"given":"G. 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